[GHC] #7661: GHC build system does not detect opt-3.0 and friends

[GHC]

#7661: GHC build system does not detect opt-3.0 and friends
---------------------------------+------------------------------------------
    Reporter:  singpolyma        |        Owner:                     
        Type:  feature request   |       Status:  new                
    Priority:  normal            |    Component:  Compiler           
     Version:  7.7               |   Resolution:                     
    Keywords:                    |           Os:  Unknown/Multiple   
Architecture:  Unknown/Multiple  |      Failure:  Building GHC failed
   Blockedby:                    |     Blocking:                     
     Related:                    |  
---------------------------------+------------------------------------------
Changes (by kgardas):

  * owner:  dterei =>
  * status:  closed => new
  * resolution:  fixed =>


Comment:

 Hi David,

 unfortunately this is not working on my Ubuntu 12.04.2 LTS on pandaboard.
 I do have both llc-3.0 and opt-3.0 in /usr/bin and in PATH:
 {{{
 $ which llc-3.0
 /usr/bin/llc-3.0
 $ which opt-3.0
 /usr/bin/opt-3.0
 }}}
 but GHC's configure does not detect them. Configuring with simple
 ./configure ends with:
 {{{
 Configure completed successfully.

    Building GHC version  : 7.7.20130214

    Build platform        : arm-unknown-linux
    Host platform         : arm-unknown-linux
    Target platform       : arm-unknown-linux

    Bootstrapping using   : /usr/bin/ghc
       which is version   : 7.4.1

    Using gcc                 : /usr/bin/gcc
       which is version       : 4.6.3
    Building a cross compiler : NO

    ld       : /usr/bin/ld
    Happy    : /usr/bin/happy (1.18.9)
    Alex     : /usr/bin/alex (3.0.1)
    Perl     : /usr/bin/perl
    dblatex  :
    xsltproc :

    Using LLVM tools
       llc   :
       opt   :

    HsColour was not found; documentation will not contain source links
 }}}

 and settings file looks:
 {{{
 $ cat settings
 [("GCC extra via C opts", " -fwrapv"),
  ("C compiler command", "/usr/bin/gcc"),
  ("C compiler flags", " -fno-stack-protector  -Wl,--hash-size=31 -Wl
 ,--reduce-memory-overheads"),
  ("ld command", "/usr/bin/ld"),
  ("ld flags", "     --hash-size=31     --reduce-memory-overheads"),
  ("ld supports compact unwind", "YES"),
  ("ld supports build-id", "YES"),
  ("ld is GNU ld", "YES"),
  ("ar command", "/usr/bin/ar"),
  ("ar flags", "q"),
  ("ar supports at file", "YES"),
  ("touch command", "touch"),
  ("dllwrap command", "/bin/false"),
  ("windres command", "/bin/false"),
  ("perl command", "/usr/bin/perl"),
  ("target os", "OSLinux"),
  ("target arch", "ArchARM {armISA = ARMv7, armISAExt = [VFPv3,NEON],
 armABI = HARD}"),
  ("target word size", "4"),
  ("target has GNU nonexec stack", "False"),
  ("target has .ident directive", "True"),
  ("target has subsections via symbols", "False"),
  ("Unregisterised", "NO"),
  ("LLVM llc command", "llc"),
  ("LLVM opt command", "opt")
  ]
 }}}

 There are two issues with this patch I'm able to see now.

 1) in aclocal.m4 in FIND_LLVM_PROG you use
 {{{
     if test "$1" == ""; then
 }}}
 but this should be:
 {{{
     if test "$$1" == ""; then
 }}}
 to result in for example "$LLC" == "" instead of "LLC" == ""

 2) Ubuntu (and Debian probably does the same), installs LLVM-3.0 package
 into /usr/lib/llvm-3.0 directory and creates a links to opt/llc into
 /usr/bin with the prefixes -3.0. That means:

 {{{
 $ ls -la /usr/bin/llc-3.0
 lrwxrwxrwx 1 root root 23 Dec 11  2011 /usr/bin/llc-3.0 ->
 ../lib/llvm-3.0/bin/llc
 }}}
 The result is that your find test where you find for file will not work as
 this is not a file, but link. You will also need to find for link (i.e.
 -type l)

 Both issues are fixed by attached patch.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7661#comment:7>
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